1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Tegra30 SoC Thermal Sensor driver 4 * 5 * Based on downstream HWMON driver from NVIDIA. 6 * Copyright (C) 2011 NVIDIA Corporation 7 * 8 * Author: Dmitry Osipenko <digetx@gmail.com> 9 * Copyright (C) 2021 GRATE-DRIVER project 10 */ 11 12 #include <linux/bitfield.h> 13 #include <linux/clk.h> 14 #include <linux/delay.h> 15 #include <linux/errno.h> 16 #include <linux/interrupt.h> 17 #include <linux/io.h> 18 #include <linux/iopoll.h> 19 #include <linux/math.h> 20 #include <linux/module.h> 21 #include <linux/of_device.h> 22 #include <linux/platform_device.h> 23 #include <linux/pm.h> 24 #include <linux/reset.h> 25 #include <linux/slab.h> 26 #include <linux/thermal.h> 27 #include <linux/types.h> 28 29 #include <soc/tegra/fuse.h> 30 31 #include "../thermal_core.h" 32 #include "../thermal_hwmon.h" 33 34 #define TSENSOR_SENSOR0_CONFIG0 0x0 35 #define TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP BIT(0) 36 #define TSENSOR_SENSOR0_CONFIG0_HW_FREQ_DIV_EN BIT(1) 37 #define TSENSOR_SENSOR0_CONFIG0_THERMAL_RST_EN BIT(2) 38 #define TSENSOR_SENSOR0_CONFIG0_DVFS_EN BIT(3) 39 #define TSENSOR_SENSOR0_CONFIG0_INTR_OVERFLOW_EN BIT(4) 40 #define TSENSOR_SENSOR0_CONFIG0_INTR_HW_FREQ_DIV_EN BIT(5) 41 #define TSENSOR_SENSOR0_CONFIG0_INTR_THERMAL_RST_EN BIT(6) 42 #define TSENSOR_SENSOR0_CONFIG0_M GENMASK(23, 8) 43 #define TSENSOR_SENSOR0_CONFIG0_N GENMASK(31, 24) 44 45 #define TSENSOR_SENSOR0_CONFIG1 0x8 46 #define TSENSOR_SENSOR0_CONFIG1_TH1 GENMASK(15, 0) 47 #define TSENSOR_SENSOR0_CONFIG1_TH2 GENMASK(31, 16) 48 49 #define TSENSOR_SENSOR0_CONFIG2 0xc 50 #define TSENSOR_SENSOR0_CONFIG2_TH3 GENMASK(15, 0) 51 52 #define TSENSOR_SENSOR0_STATUS0 0x18 53 #define TSENSOR_SENSOR0_STATUS0_STATE GENMASK(2, 0) 54 #define TSENSOR_SENSOR0_STATUS0_INTR BIT(8) 55 #define TSENSOR_SENSOR0_STATUS0_CURRENT_VALID BIT(9) 56 57 #define TSENSOR_SENSOR0_TS_STATUS1 0x1c 58 #define TSENSOR_SENSOR0_TS_STATUS1_CURRENT_COUNT GENMASK(31, 16) 59 60 #define TEGRA30_FUSE_TEST_PROG_VER 0x28 61 62 #define TEGRA30_FUSE_TSENSOR_CALIB 0x98 63 #define TEGRA30_FUSE_TSENSOR_CALIB_LOW GENMASK(15, 0) 64 #define TEGRA30_FUSE_TSENSOR_CALIB_HIGH GENMASK(31, 16) 65 66 #define TEGRA30_FUSE_SPARE_BIT 0x144 67 68 struct tegra_tsensor; 69 70 struct tegra_tsensor_calibration_data { 71 int a, b, m, n, p, r; 72 }; 73 74 struct tegra_tsensor_channel { 75 void __iomem *regs; 76 unsigned int id; 77 struct tegra_tsensor *ts; 78 struct thermal_zone_device *tzd; 79 }; 80 81 struct tegra_tsensor { 82 void __iomem *regs; 83 bool swap_channels; 84 struct clk *clk; 85 struct device *dev; 86 struct reset_control *rst; 87 struct tegra_tsensor_channel ch[2]; 88 struct tegra_tsensor_calibration_data calib; 89 }; 90 91 static int tegra_tsensor_hw_enable(const struct tegra_tsensor *ts) 92 { 93 u32 val; 94 int err; 95 96 err = reset_control_assert(ts->rst); 97 if (err) { 98 dev_err(ts->dev, "failed to assert hardware reset: %d\n", err); 99 return err; 100 } 101 102 err = clk_prepare_enable(ts->clk); 103 if (err) { 104 dev_err(ts->dev, "failed to enable clock: %d\n", err); 105 return err; 106 } 107 108 fsleep(1000); 109 110 err = reset_control_deassert(ts->rst); 111 if (err) { 112 dev_err(ts->dev, "failed to deassert hardware reset: %d\n", err); 113 goto disable_clk; 114 } 115 116 /* 117 * Sensors are enabled after reset by default, but not gauging 118 * until clock counter is programmed. 119 * 120 * M: number of reference clock pulses after which every 121 * temperature / voltage measurement is made 122 * 123 * N: number of reference clock counts for which the counter runs 124 */ 125 val = FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_M, 12500); 126 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_N, 255); 127 128 /* apply the same configuration to both channels */ 129 writel_relaxed(val, ts->regs + 0x40 + TSENSOR_SENSOR0_CONFIG0); 130 writel_relaxed(val, ts->regs + 0x80 + TSENSOR_SENSOR0_CONFIG0); 131 132 return 0; 133 134 disable_clk: 135 clk_disable_unprepare(ts->clk); 136 137 return err; 138 } 139 140 static int tegra_tsensor_hw_disable(const struct tegra_tsensor *ts) 141 { 142 int err; 143 144 err = reset_control_assert(ts->rst); 145 if (err) { 146 dev_err(ts->dev, "failed to assert hardware reset: %d\n", err); 147 return err; 148 } 149 150 clk_disable_unprepare(ts->clk); 151 152 return 0; 153 } 154 155 static void devm_tegra_tsensor_hw_disable(void *data) 156 { 157 const struct tegra_tsensor *ts = data; 158 159 tegra_tsensor_hw_disable(ts); 160 } 161 162 static int tegra_tsensor_get_temp(void *data, int *temp) 163 { 164 const struct tegra_tsensor_channel *tsc = data; 165 const struct tegra_tsensor *ts = tsc->ts; 166 int err, c1, c2, c3, c4, counter; 167 u32 val; 168 169 /* 170 * Counter will be invalid if hardware is misprogrammed or not enough 171 * time passed since the time when sensor was enabled. 172 */ 173 err = readl_relaxed_poll_timeout(tsc->regs + TSENSOR_SENSOR0_STATUS0, val, 174 val & TSENSOR_SENSOR0_STATUS0_CURRENT_VALID, 175 21 * USEC_PER_MSEC, 176 21 * USEC_PER_MSEC * 50); 177 if (err) { 178 dev_err_once(ts->dev, "ch%u: counter invalid\n", tsc->id); 179 return err; 180 } 181 182 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_TS_STATUS1); 183 counter = FIELD_GET(TSENSOR_SENSOR0_TS_STATUS1_CURRENT_COUNT, val); 184 185 /* 186 * This shouldn't happen with a valid counter status, nevertheless 187 * lets verify the value since it's in a separate (from status) 188 * register. 189 */ 190 if (counter == 0xffff) { 191 dev_err_once(ts->dev, "ch%u: counter overflow\n", tsc->id); 192 return -EINVAL; 193 } 194 195 /* 196 * temperature = a * counter + b 197 * temperature = m * (temperature ^ 2) + n * temperature + p 198 */ 199 c1 = DIV_ROUND_CLOSEST(ts->calib.a * counter + ts->calib.b, 1000000); 200 c1 = c1 ?: 1; 201 c2 = DIV_ROUND_CLOSEST(ts->calib.p, c1); 202 c3 = c1 * ts->calib.m; 203 c4 = ts->calib.n; 204 205 *temp = DIV_ROUND_CLOSEST(c1 * (c2 + c3 + c4), 1000); 206 207 return 0; 208 } 209 210 static int tegra_tsensor_temp_to_counter(const struct tegra_tsensor *ts, int temp) 211 { 212 int c1, c2; 213 214 c1 = DIV_ROUND_CLOSEST(ts->calib.p - temp * 1000, ts->calib.m); 215 c2 = -ts->calib.r - int_sqrt(ts->calib.r * ts->calib.r - c1); 216 217 return DIV_ROUND_CLOSEST(c2 * 1000000 - ts->calib.b, ts->calib.a); 218 } 219 220 static int tegra_tsensor_set_trips(void *data, int low, int high) 221 { 222 const struct tegra_tsensor_channel *tsc = data; 223 const struct tegra_tsensor *ts = tsc->ts; 224 u32 val; 225 226 /* 227 * TSENSOR doesn't trigger interrupt on the "low" temperature breach, 228 * hence bail out if high temperature is unspecified. 229 */ 230 if (high == INT_MAX) 231 return 0; 232 233 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG1); 234 val &= ~TSENSOR_SENSOR0_CONFIG1_TH1; 235 236 high = tegra_tsensor_temp_to_counter(ts, high); 237 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG1_TH1, high); 238 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG1); 239 240 return 0; 241 } 242 243 static const struct thermal_zone_of_device_ops ops = { 244 .get_temp = tegra_tsensor_get_temp, 245 .set_trips = tegra_tsensor_set_trips, 246 }; 247 248 static bool 249 tegra_tsensor_handle_channel_interrupt(const struct tegra_tsensor *ts, 250 unsigned int id) 251 { 252 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 253 u32 val; 254 255 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_STATUS0); 256 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_STATUS0); 257 258 if (FIELD_GET(TSENSOR_SENSOR0_STATUS0_STATE, val) == 5) 259 dev_err_ratelimited(ts->dev, "ch%u: counter overflowed\n", id); 260 261 if (!FIELD_GET(TSENSOR_SENSOR0_STATUS0_INTR, val)) 262 return false; 263 264 thermal_zone_device_update(tsc->tzd, THERMAL_EVENT_UNSPECIFIED); 265 266 return true; 267 } 268 269 static irqreturn_t tegra_tsensor_isr(int irq, void *data) 270 { 271 const struct tegra_tsensor *ts = data; 272 bool handled = false; 273 unsigned int i; 274 275 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) 276 handled |= tegra_tsensor_handle_channel_interrupt(ts, i); 277 278 return handled ? IRQ_HANDLED : IRQ_NONE; 279 } 280 281 static int tegra_tsensor_disable_hw_channel(const struct tegra_tsensor *ts, 282 unsigned int id) 283 { 284 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 285 struct thermal_zone_device *tzd = tsc->tzd; 286 u32 val; 287 int err; 288 289 if (!tzd) 290 goto stop_channel; 291 292 err = thermal_zone_device_disable(tzd); 293 if (err) { 294 dev_err(ts->dev, "ch%u: failed to disable zone: %d\n", id, err); 295 return err; 296 } 297 298 stop_channel: 299 /* stop channel gracefully */ 300 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 301 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP, 1); 302 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 303 304 return 0; 305 } 306 307 static void tegra_tsensor_get_hw_channel_trips(struct thermal_zone_device *tzd, 308 int *hot_trip, int *crit_trip) 309 { 310 unsigned int i; 311 312 /* 313 * 90C is the maximal critical temperature of all Tegra30 SoC variants, 314 * use it for the default trip if unspecified in a device-tree. 315 */ 316 *hot_trip = 85000; 317 *crit_trip = 90000; 318 319 for (i = 0; i < tzd->num_trips; i++) { 320 enum thermal_trip_type type; 321 int trip_temp; 322 323 tzd->ops->get_trip_temp(tzd, i, &trip_temp); 324 tzd->ops->get_trip_type(tzd, i, &type); 325 326 if (type == THERMAL_TRIP_HOT) 327 *hot_trip = trip_temp; 328 329 if (type == THERMAL_TRIP_CRITICAL) 330 *crit_trip = trip_temp; 331 } 332 333 /* clamp hardware trips to the calibration limits */ 334 *hot_trip = clamp(*hot_trip, 25000, 90000); 335 336 /* 337 * Kernel will perform a normal system shut down if it will 338 * see that critical temperature is breached, hence set the 339 * hardware limit by 5C higher in order to allow system to 340 * shut down gracefully before sending signal to the Power 341 * Management controller. 342 */ 343 *crit_trip = clamp(*crit_trip + 5000, 25000, 90000); 344 } 345 346 static int tegra_tsensor_enable_hw_channel(const struct tegra_tsensor *ts, 347 unsigned int id) 348 { 349 const struct tegra_tsensor_channel *tsc = &ts->ch[id]; 350 struct thermal_zone_device *tzd = tsc->tzd; 351 int err, hot_trip = 0, crit_trip = 0; 352 u32 val; 353 354 if (!tzd) { 355 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 356 val &= ~TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP; 357 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 358 359 return 0; 360 } 361 362 tegra_tsensor_get_hw_channel_trips(tzd, &hot_trip, &crit_trip); 363 364 /* prevent potential racing with tegra_tsensor_set_trips() */ 365 mutex_lock(&tzd->lock); 366 367 dev_info_once(ts->dev, "ch%u: PMC emergency shutdown trip set to %dC\n", 368 id, DIV_ROUND_CLOSEST(crit_trip, 1000)); 369 370 hot_trip = tegra_tsensor_temp_to_counter(ts, hot_trip); 371 crit_trip = tegra_tsensor_temp_to_counter(ts, crit_trip); 372 373 /* program LEVEL2 counter threshold */ 374 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG1); 375 val &= ~TSENSOR_SENSOR0_CONFIG1_TH2; 376 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG1_TH2, hot_trip); 377 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG1); 378 379 /* program LEVEL3 counter threshold */ 380 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG2); 381 val &= ~TSENSOR_SENSOR0_CONFIG2_TH3; 382 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG2_TH3, crit_trip); 383 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG2); 384 385 /* 386 * Enable sensor, emergency shutdown, interrupts for level 1/2/3 387 * breaches and counter overflow condition. 388 * 389 * Disable DIV2 throttle for now since we need to figure out how 390 * to integrate it properly with the thermal framework. 391 * 392 * Thermal levels supported by hardware: 393 * 394 * Level 0 = cold 395 * Level 1 = passive cooling (cpufreq DVFS) 396 * Level 2 = passive cooling assisted by hardware (DIV2) 397 * Level 3 = emergency shutdown assisted by hardware (PMC) 398 */ 399 val = readl_relaxed(tsc->regs + TSENSOR_SENSOR0_CONFIG0); 400 val &= ~TSENSOR_SENSOR0_CONFIG0_SENSOR_STOP; 401 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_DVFS_EN, 1); 402 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_HW_FREQ_DIV_EN, 0); 403 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_THERMAL_RST_EN, 1); 404 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_OVERFLOW_EN, 1); 405 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_HW_FREQ_DIV_EN, 1); 406 val |= FIELD_PREP(TSENSOR_SENSOR0_CONFIG0_INTR_THERMAL_RST_EN, 1); 407 writel_relaxed(val, tsc->regs + TSENSOR_SENSOR0_CONFIG0); 408 409 mutex_unlock(&tzd->lock); 410 411 err = thermal_zone_device_enable(tzd); 412 if (err) { 413 dev_err(ts->dev, "ch%u: failed to enable zone: %d\n", id, err); 414 return err; 415 } 416 417 return 0; 418 } 419 420 static bool tegra_tsensor_fuse_read_spare(unsigned int spare) 421 { 422 u32 val = 0; 423 424 tegra_fuse_readl(TEGRA30_FUSE_SPARE_BIT + spare * 4, &val); 425 426 return !!val; 427 } 428 429 static int tegra_tsensor_nvmem_setup(struct tegra_tsensor *ts) 430 { 431 u32 i, ate_ver = 0, cal = 0, t1_25C = 0, t2_90C = 0; 432 int err, c1_25C, c2_90C; 433 434 err = tegra_fuse_readl(TEGRA30_FUSE_TEST_PROG_VER, &ate_ver); 435 if (err) { 436 dev_err_probe(ts->dev, err, "failed to get ATE version\n"); 437 return err; 438 } 439 440 if (ate_ver < 8) { 441 dev_info(ts->dev, "unsupported ATE version: %u\n", ate_ver); 442 return -ENODEV; 443 } 444 445 /* 446 * We have two TSENSOR channels in a two different spots on SoC. 447 * Second channel provides more accurate data on older SoC versions, 448 * use it as a primary channel. 449 */ 450 if (ate_ver <= 21) { 451 dev_info_once(ts->dev, 452 "older ATE version detected, channels remapped\n"); 453 ts->swap_channels = true; 454 } 455 456 err = tegra_fuse_readl(TEGRA30_FUSE_TSENSOR_CALIB, &cal); 457 if (err) { 458 dev_err(ts->dev, "failed to get calibration data: %d\n", err); 459 return err; 460 } 461 462 /* get calibrated counter values for 25C/90C thresholds */ 463 c1_25C = FIELD_GET(TEGRA30_FUSE_TSENSOR_CALIB_LOW, cal); 464 c2_90C = FIELD_GET(TEGRA30_FUSE_TSENSOR_CALIB_HIGH, cal); 465 466 /* and calibrated temperatures corresponding to the counter values */ 467 for (i = 0; i < 7; i++) { 468 t1_25C |= tegra_tsensor_fuse_read_spare(14 + i) << i; 469 t1_25C |= tegra_tsensor_fuse_read_spare(21 + i) << i; 470 471 t2_90C |= tegra_tsensor_fuse_read_spare(0 + i) << i; 472 t2_90C |= tegra_tsensor_fuse_read_spare(7 + i) << i; 473 } 474 475 if (c2_90C - c1_25C <= t2_90C - t1_25C) { 476 dev_err(ts->dev, "invalid calibration data: %d %d %u %u\n", 477 c2_90C, c1_25C, t2_90C, t1_25C); 478 return -EINVAL; 479 } 480 481 /* all calibration coefficients are premultiplied by 1000000 */ 482 483 ts->calib.a = DIV_ROUND_CLOSEST((t2_90C - t1_25C) * 1000000, 484 (c2_90C - c1_25C)); 485 486 ts->calib.b = t1_25C * 1000000 - ts->calib.a * c1_25C; 487 488 if (tegra_sku_info.revision == TEGRA_REVISION_A01) { 489 ts->calib.m = -2775; 490 ts->calib.n = 1338811; 491 ts->calib.p = -7300000; 492 } else { 493 ts->calib.m = -3512; 494 ts->calib.n = 1528943; 495 ts->calib.p = -11100000; 496 } 497 498 /* except the coefficient of a reduced quadratic equation */ 499 ts->calib.r = DIV_ROUND_CLOSEST(ts->calib.n, ts->calib.m * 2); 500 501 dev_info_once(ts->dev, 502 "calibration: %d %d %u %u ATE ver: %u SoC rev: %u\n", 503 c2_90C, c1_25C, t2_90C, t1_25C, ate_ver, 504 tegra_sku_info.revision); 505 506 return 0; 507 } 508 509 static int tegra_tsensor_register_channel(struct tegra_tsensor *ts, 510 unsigned int id) 511 { 512 struct tegra_tsensor_channel *tsc = &ts->ch[id]; 513 unsigned int hw_id = ts->swap_channels ? !id : id; 514 515 tsc->ts = ts; 516 tsc->id = id; 517 tsc->regs = ts->regs + 0x40 * (hw_id + 1); 518 519 tsc->tzd = devm_thermal_zone_of_sensor_register(ts->dev, id, tsc, &ops); 520 if (IS_ERR(tsc->tzd)) { 521 if (PTR_ERR(tsc->tzd) != -ENODEV) 522 return dev_err_probe(ts->dev, PTR_ERR(tsc->tzd), 523 "failed to register thermal zone\n"); 524 525 /* 526 * It's okay if sensor isn't assigned to any thermal zone 527 * in a device-tree. 528 */ 529 tsc->tzd = NULL; 530 return 0; 531 } 532 533 if (devm_thermal_add_hwmon_sysfs(tsc->tzd)) 534 dev_warn(ts->dev, "failed to add hwmon sysfs attributes\n"); 535 536 return 0; 537 } 538 539 static int tegra_tsensor_probe(struct platform_device *pdev) 540 { 541 struct tegra_tsensor *ts; 542 unsigned int i; 543 int err, irq; 544 545 ts = devm_kzalloc(&pdev->dev, sizeof(*ts), GFP_KERNEL); 546 if (!ts) 547 return -ENOMEM; 548 549 irq = platform_get_irq(pdev, 0); 550 if (irq < 0) 551 return irq; 552 553 ts->dev = &pdev->dev; 554 platform_set_drvdata(pdev, ts); 555 556 ts->regs = devm_platform_ioremap_resource(pdev, 0); 557 if (IS_ERR(ts->regs)) 558 return PTR_ERR(ts->regs); 559 560 ts->clk = devm_clk_get(&pdev->dev, NULL); 561 if (IS_ERR(ts->clk)) 562 return dev_err_probe(&pdev->dev, PTR_ERR(ts->clk), 563 "failed to get clock\n"); 564 565 ts->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); 566 if (IS_ERR(ts->rst)) 567 return dev_err_probe(&pdev->dev, PTR_ERR(ts->rst), 568 "failed to get reset control\n"); 569 570 err = tegra_tsensor_nvmem_setup(ts); 571 if (err) 572 return err; 573 574 err = tegra_tsensor_hw_enable(ts); 575 if (err) 576 return err; 577 578 err = devm_add_action_or_reset(&pdev->dev, 579 devm_tegra_tsensor_hw_disable, 580 ts); 581 if (err) 582 return err; 583 584 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 585 err = tegra_tsensor_register_channel(ts, i); 586 if (err) 587 return err; 588 } 589 590 err = devm_request_threaded_irq(&pdev->dev, irq, NULL, 591 tegra_tsensor_isr, IRQF_ONESHOT, 592 "tegra_tsensor", ts); 593 if (err) 594 return dev_err_probe(&pdev->dev, err, 595 "failed to request interrupt\n"); 596 597 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 598 err = tegra_tsensor_enable_hw_channel(ts, i); 599 if (err) 600 return err; 601 } 602 603 return 0; 604 } 605 606 static int __maybe_unused tegra_tsensor_suspend(struct device *dev) 607 { 608 struct tegra_tsensor *ts = dev_get_drvdata(dev); 609 unsigned int i; 610 int err; 611 612 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 613 err = tegra_tsensor_disable_hw_channel(ts, i); 614 if (err) 615 goto enable_channel; 616 } 617 618 err = tegra_tsensor_hw_disable(ts); 619 if (err) 620 goto enable_channel; 621 622 return 0; 623 624 enable_channel: 625 while (i--) 626 tegra_tsensor_enable_hw_channel(ts, i); 627 628 return err; 629 } 630 631 static int __maybe_unused tegra_tsensor_resume(struct device *dev) 632 { 633 struct tegra_tsensor *ts = dev_get_drvdata(dev); 634 unsigned int i; 635 int err; 636 637 err = tegra_tsensor_hw_enable(ts); 638 if (err) 639 return err; 640 641 for (i = 0; i < ARRAY_SIZE(ts->ch); i++) { 642 err = tegra_tsensor_enable_hw_channel(ts, i); 643 if (err) 644 return err; 645 } 646 647 return 0; 648 } 649 650 static const struct dev_pm_ops tegra_tsensor_pm_ops = { 651 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_tsensor_suspend, 652 tegra_tsensor_resume) 653 }; 654 655 static const struct of_device_id tegra_tsensor_of_match[] = { 656 { .compatible = "nvidia,tegra30-tsensor", }, 657 {}, 658 }; 659 MODULE_DEVICE_TABLE(of, tegra_tsensor_of_match); 660 661 static struct platform_driver tegra_tsensor_driver = { 662 .probe = tegra_tsensor_probe, 663 .driver = { 664 .name = "tegra30-tsensor", 665 .of_match_table = tegra_tsensor_of_match, 666 .pm = &tegra_tsensor_pm_ops, 667 }, 668 }; 669 module_platform_driver(tegra_tsensor_driver); 670 671 MODULE_DESCRIPTION("NVIDIA Tegra30 Thermal Sensor driver"); 672 MODULE_AUTHOR("Dmitry Osipenko <digetx@gmail.com>"); 673 MODULE_LICENSE("GPL"); 674